* This file is part of DisOrder
* Copyright (C) 2008 Richard Kettlewell
*
- * This program is free software; you can redistribute it and/or modify
+ * This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
+ * the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
* You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/** @file lib/macros.c
* @brief Macro expansion
*/
-#include <config.h>
-#include "types.h"
+#include "common.h"
-#include <string.h>
#include <ctype.h>
-#include <assert.h>
-#include <stdio.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
/* Parsing ------------------------------------------------------------------ */
+static int next_non_whitespace(const char *input,
+ const char *end) {
+ while(input < end && isspace((unsigned char)*input))
+ ++input;
+ return input < end ? *input : -1;
+}
+
/** @brief Parse a template
* @param filename Input filename (for diagnostics)
* @param line Line number (use 1 on initial call)
int line,
const char *input,
const char *end) {
- int braces, expansion_start_line, argument_start_line;
- const char *argument_start, *argument_end, *p;
+ int braces, argument_start_line, obracket, cbracket;
+ const char *argument_start, *argument_end;
struct mx_node_vector v[1];
struct dynstr d[1];
struct mx_node *head = 0, **tailp = &head, *e;
- int omitted_terminator;
if(!end)
end = input + strlen(input);
while(input < end) {
if(*input != '@') {
- expansion_start_line = line;
+ e = xmalloc(sizeof *e);
+ e->next = 0;
+ e->filename = filename;
+ e->line = line;
+ e->type = MX_TEXT;
dynstr_init(d);
/* Gather up text without any expansions in. */
while(input < end && *input != '@') {
dynstr_append(d, *input++);
}
dynstr_terminate(d);
- e = xmalloc(sizeof *e);
- e->next = 0;
- e->filename = filename;
- e->line = expansion_start_line;
- e->type = MX_TEXT;
e->text = d->vec;
*tailp = e;
tailp = &e->next;
continue;
}
- mx_node_vector_init(v);
- braces = 0;
- p = input;
- ++input;
- expansion_start_line = line;
- omitted_terminator = 0;
- while(!omitted_terminator && input < end && *input != '@') {
- /* Skip whitespace */
- if(isspace((unsigned char)*input)) {
- if(*input == '\n')
- ++line;
- ++input;
- continue;
+ if(input + 1 < end)
+ switch(input[1]) {
+ case '@':
+ /* '@@' expands to '@' */
+ e = xmalloc(sizeof *e);
+ e->next = 0;
+ e->filename = filename;
+ e->line = line;
+ e->type = MX_TEXT;
+ e->text = "@";
+ *tailp = e;
+ tailp = &e->next;
+ input += 2;
+ continue;
+ case '#':
+ /* '@#' starts a (newline-eating comment), like dnl */
+ input += 2;
+ while(input < end && *input != '\n')
+ ++input;
+ if(*input == '\n') {
+ ++line;
+ ++input;
+ }
+ continue;
+ case '_':
+ /* '@_' expands to nothing. It's there to allow dump to terminate
+ * expansions without having to know what follows. */
+ input += 2;
+ continue;
}
- if(*input == '{') {
- /* This is a bracketed argument. We'll walk over it counting
- * braces to figure out where the end is. */
- ++input;
- argument_start = input;
- argument_start_line = line;
- while(input < end && (*input != '}' || braces > 0)) {
- switch(*input++) {
- case '{': ++braces; break;
- case '}': --braces; break;
- case '\n': ++line; break;
- }
- }
- /* If we run out of input without seeing a '}' that's an error */
- if(input >= end)
- fatal(0, "%s:%d: unterminated expansion '%.*s'",
+ /* It's a full expansion */
+ ++input;
+ e = xmalloc(sizeof *e);
+ e->next = 0;
+ e->filename = filename;
+ e->line = line;
+ e->type = MX_EXPANSION;
+ /* Collect the expansion name. Expansion names start with an alnum and
+ * consist of alnums and '-'. We don't permit whitespace between the '@'
+ * and the name. */
+ dynstr_init(d);
+ if(input == end)
+ fatal(0, "%s:%d: invalid expansion syntax (truncated)",
+ filename, e->line);
+ if(!isalnum((unsigned char)*input))
+ fatal(0, "%s:%d: invalid expansion syntax (unexpected %#x)",
+ filename, e->line, (unsigned char)*input);
+ while(input < end && (isalnum((unsigned char)*input) || *input == '-'))
+ dynstr_append(d, *input++);
+ dynstr_terminate(d);
+ e->name = d->vec;
+ /* See what the bracket character is */
+ obracket = next_non_whitespace(input, end);
+ switch(obracket) {
+ case '(': cbracket = ')'; break;
+ case '[': cbracket = ']'; break;
+ case '{': cbracket = '}'; break;
+ default: cbracket = obracket = -1; break; /* no arguments */
+ }
+ mx_node_vector_init(v);
+ if(obracket >= 0) {
+ /* Gather up arguments */
+ while(next_non_whitespace(input, end) == obracket) {
+ while(isspace((unsigned char)*input)) {
+ if(*input == '\n')
+ ++line;
+ ++input;
+ }
+ ++input; /* the bracket */
+ braces = 0;
+ /* Find the end of the argument */
+ argument_start = input;
+ argument_start_line = line;
+ while(input < end && (*input != cbracket || braces > 0)) {
+ const int c = *input++;
+
+ if(c == obracket)
+ ++braces;
+ else if(c == cbracket)
+ --braces;
+ else if(c == '\n')
+ ++line;
+ }
+ if(input >= end) {
+ /* We ran out of input without encountering a balanced cbracket */
+ fatal(0, "%s:%d: unterminated expansion argument '%.*s'",
filename, argument_start_line,
(int)(input - argument_start), argument_start);
+ }
/* Consistency check */
- assert(*input == '}');
+ assert(*input == cbracket);
/* Record the end of the argument */
argument_end = input;
- /* Step over the '}' */
+ /* Step over the cbracket */
++input;
- if(input < end && isspace((unsigned char)*input)) {
- /* There is at least some whitespace after the '}'. Look
- * ahead and see what is after all the whitespace. */
- for(p = input; p < end && isspace((unsigned char)*p); ++p)
- ;
- /* Now we are looking after the whitespace. If it's
- * anything other than '{', including the end of the input,
- * then we infer that this expansion finished at the '}' we
- * just saw. (NB that we don't move input forward to p -
- * the whitespace is NOT part of the expansion.) */
- if(p == end || *p != '{')
- omitted_terminator = 1;
- }
- } else {
- /* We are looking at an unbracketed argument. (A common example would
- * be the expansion or macro name.) This is terminated by an '@'
- * (indicating the end of the expansion), a ':' (allowing a subsequent
- * unbracketed argument) or a '{' (allowing a bracketed argument). The
- * end of the input will also do. */
- argument_start = input;
- argument_start_line = line;
- while(input < end
- && *input != '@' && *input != '{' && *input != ':') {
- if(*input == '\n') ++line;
- ++input;
- }
- argument_end = input;
- /* Trailing whitespace is not significant in unquoted arguments (and
- * leading whitespace is eliminated by the whitespace skip above). */
- while(argument_end > argument_start
- && isspace((unsigned char)argument_end[-1]))
- --argument_end;
- /* Step over the ':' if that's what we see */
- if(input < end && *input == ':')
- ++input;
+ /* Now we have an argument in [argument_start, argument_end), and we
+ * know its filename and initial line number. This is sufficient to
+ * parse it. */
+ mx_node_vector_append(v, mx_parse(filename, argument_start_line,
+ argument_start, argument_end));
}
- /* Now we have an argument in [argument_start, argument_end), and we know
- * its filename and initial line number. This is sufficient to parse
- * it. */
- mx_node_vector_append(v, mx_parse(filename, argument_start_line,
- argument_start, argument_end));
}
- /* We're at the end of an expansion. We might have hit the end of the
- * input, we might have hit an '@' or we might have matched the
- * omitted_terminator criteria. */
- if(input < end) {
- if(!omitted_terminator) {
- assert(*input == '@');
- ++input;
- }
- }
- /* @@ terminates this file */
- if(v->nvec == 0)
- break;
- /* Currently we require that the first element, the expansion name, is
- * always plain text. Removing this restriction would raise some
- * interesting possibilities but for the time being it is considered an
- * error. */
- if(v->vec[0]->type != MX_TEXT)
- fatal(0, "%s:%d: expansion names may not themselves contain expansions",
- v->vec[0]->filename, v->vec[0]->line);
/* Guarantee a NULL terminator (for the case where there's more than one
* argument) */
mx_node_vector_terminate(v);
- e = xmalloc(sizeof *e);
- e->next = 0;
- e->filename = filename;
- e->line = expansion_start_line;
- e->type = MX_EXPANSION;
- e->name = v->vec[0]->text;
- e->nargs = v->nvec - 1;
- e->args = v->nvec > 1 ? &v->vec[1] : 0;
+ /* Fill in the remains of the node */
+ e->nargs = v->nvec;
+ e->args = v->vec;
*tailp = e;
tailp = &e->next;
}
static void mx__dump(struct dynstr *d, const struct mx_node *m) {
int n;
-
+ const struct mx_node *mm;
+
if(!m)
return;
switch(m->type) {
case MX_TEXT:
+ if(m->text[0] == '@')
+ dynstr_append(d, '@');
dynstr_append_string(d, m->text);
break;
case MX_EXPANSION:
mx__dump(d, m->args[n]);
dynstr_append(d, '}');
}
- dynstr_append(d, '@');
+ /* If the next non-whitespace is '{', add @_ to stop it being
+ * misinterpreted */
+ mm = m->next;
+ while(mm && mm->type == MX_TEXT) {
+ switch(next_non_whitespace(mm->text, mm->text + strlen(mm->text))) {
+ case -1:
+ mm = mm->next;
+ continue;
+ case '{':
+ dynstr_append_string(d, "@_");
+ break;
+ default:
+ break;
+ }
+ break;
+ }
break;
default:
assert(!"invalid m->type");
mx__dump(d, m->next);
}
-/** @brief Dump a parse macro expansion to a string */
+/** @brief Dump a parse macro expansion to a string
+ *
+ * Not of production quality! Only intended for testing!
+ */
char *mx_dump(const struct mx_node *m) {
struct dynstr d[1];
e->args = args;
e->callback = callback;
e->definition = definition;
- return hash_add(expansions, name, &e,
- ((flags & EXP_TYPE_MASK) == EXP_MACRO)
- ? HASH_INSERT : HASH_INSERT_OR_REPLACE);
+ return hash_add(expansions, name, &e, HASH_INSERT_OR_REPLACE);
}
/** @brief Register a simple expansion rule
const struct mx_node *definition) {
if(mx__register(EXP_MACRO, name, nargs, nargs, args, 0/*callback*/,
definition)) {
+#if 0
/* This locates the error to the definition, which may be a line or two
* beyond the @define command itself. The backtrace generated by
* mx_expand() may help more. */
error(0, "%s:%d: duplicate definition of '%s'",
definition->filename, definition->line, name);
+#endif
return -2;
}
return 0;
*/
const struct mx_node *mx_rewrite(const struct mx_node *definition,
hash *h) {
- const struct mx_node *head = 0, **tailp = &head, *argvalue, *m, *mm;
+ const struct mx_node *head = 0, **tailp = &head, *argvalue, *m, *mm, **ap;
struct mx_node *nm;
int n;
break;
case MX_EXPANSION:
if(m->nargs == 0
- && (argvalue = *(const struct mx_node **)hash_find(h, m->name))) {
+ && (ap = hash_find(h, m->name))) {
/* This expansion has no arguments and its name matches one of the
* macro arguments. (Even if it's a valid expansion name we override
* it.) We insert its value at this point. We do NOT recursively
* We need to recreate the list structure but a shallow copy will
* suffice here.
*/
+ argvalue = *ap;
for(mm = argvalue; mm; mm = mm->next) {
nm = xmalloc(sizeof *nm);
*nm = *mm;
~mdw / disorder / blobdiff